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std::ranges::cartesian_product_view<First, Vs...>:: cartesian_product_view

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Ranges library
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std::ranges::cartesian_product_view
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cartesian_product_view::cartesian_product_view
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constexpr cartesian_product_view ( ) = default ;
(1) (自 C++23 起)
constexpr explicit cartesian_product_view ( First first_base, Vs... bases ) ;
(2) (自 C++23 起)

构造一个 cartesian_product_view 。

1) 默认构造函数。 默认初始化 底层数据成员 base_ 。
2) 通过使用 std :: move ( first_base ) , std :: move ( bases ) ... 进行初始化，移动构造底层 base_ 。

参数

first_base - 首个需要适配的视图对象
bases - 需要适配的视图对象包

示例

运行此代码 
#include <array>
#include <format>
#include <iostream>
#include <ranges>
#include <vector>
int main()
{
    auto x = std::array{'A', 'B'};
    auto y = std::vector{1, 2, 3};
    auto z = std::vector{-1, -2, -3};
    auto v = std::ranges::cartesian_product_view(x, y, z); // 重载 (2)
    for (int i{1}; auto const& [rx, ry, rz] : v)
        std::cout << std::format("({} {} {}){}", rx, ry, rz, (i++ % 3) ? ' ' : '\n');
}

输出： 

(A 1 -1) (A 1 -2) (A 1 -3)
(A 2 -1) (A 2 -2) (A 2 -3)
(A 3 -1) (A 3 -2) (A 3 -3)
(B 1 -1) (B 1 -2) (B 1 -3)
(B 2 -1) (B 2 -2) (B 2 -3)
(B 3 -1) (B 3 -2) (B 3 -3)